In April, 14-year-old Bluhm blogged about how the girls in her ballet class were always complaining they were fat. She then posted a petition asking Seventeen to print one unaltered photo in its magazine every month.

Within days, she had 25,000 signatures, and by the end of the month, the magazine’s editor-in-chief, Ann Shoket, invited Bluhm to visit Seventeen’s offices in New York.

Shoket wrote in the editor’s letter in the August issue that after she heard from girls “who were concerned that we’d strayed from our promise to show real girls as they really are,” the publication drafted an eight-point Body Peace Treaty, which promises that it will “never change girls’ body or face shapes” and use only images of “real girls and models who are healthy.”

Photoshop will still be used on flyaway hairs and such, but Seventeen will now post before-and-after images of the shoots on the magazine’s Tumblr blog so readers can see for themselves what was changed and what wasn’t.

On Tuesday of this week, Bluhm wrote “Seventeen listened!” on her petition page, adding, “This is a huge victory, and I’m so unbelievably happy.”